Maggie Rellihan, Kaitlyn Fiola, and Dana Bailey

Geometric Mean Altitude Theorem
http://jwilson.coe.uga.edu/emt668/emat6680.folders/brooks/6690stuff/righttriangle/rightday3.html
This site is a little tutorial on how to find the altitude with the geometric mean. It is very helpful! I would reccomend going along with it step by step to have a much clearer understanding of the geometric mean altitude theorem.

Geometric Mean Altitude Theorem: Kaitlyn Fiola
http://www.regentsprep.org/Regents/math/geometry/GP12/LMeanP.htm
This site is a whole page that explains this theorem and it allows you to practice with the solution answers. It is much easier to understand if you go through the whole thing step by step.

Maggie rellihan: Geometric Mean Altitude Theorem.
http://www.cliffsnotes.com/study_guide/Altitude-to-the-Hypotenuse.topicArticleId-18851,articleId-18818.html

In this website, it gives multiple examples and samples of Geometric Mean Altitude Theorem problems. They show the question and step by step, show how to solve and deal with Geometric mean altitude theorem. This website simply explains this theorem in an easy way.